pata: remove the at91 driver (3075b62d) · Commits · 戴 / test

drivers/ata/Kconfig

+0 −8

Original line number	Diff line number	Diff line
		@@ -884,14 +884,6 @@ config PATA_AT32

		If unsure, say N.

		config PATA_AT91
		tristate "PATA support for AT91SAM9260"
		depends on ARM && SOC_AT91SAM9
		help
		This option enables support for IDE devices on the Atmel AT91SAM9260 SoC.

		If unsure, say N.

		config PATA_CMD640_PCI
		tristate "CMD640 PCI PATA support (Experimental)"
		depends on PCI

drivers/ata/Makefile

+0 −1

Original line number	Diff line number	Diff line
		@@ -91,7 +91,6 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c105.o

		# SFF PIO only
		obj-$(CONFIG_PATA_AT32) += pata_at32.o
		obj-$(CONFIG_PATA_AT91) += pata_at91.o
		obj-$(CONFIG_PATA_CMD640_PCI) += pata_cmd640.o
		obj-$(CONFIG_PATA_FALCON) += pata_falcon.o
		obj-$(CONFIG_PATA_ISAPNP) += pata_isapnp.o

drivers/ata/pata_at91.c

deleted100644 → 0

+0 −503

Original line number	Diff line number	Diff line
		/*
		* PATA driver for AT91SAM9260 Static Memory Controller
		* with CompactFlash interface in True IDE mode
		*
		* Copyright (C) 2009 Matyukevich Sergey
		* 2011 Igor Plyatov
		*
		* Based on:
		* * generic platform driver by Paul Mundt: drivers/ata/pata_platform.c
		* * pata_at32 driver by Kristoffer Nyborg Gregertsen
		* * at91_ide driver by Stanislaw Gruszka
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License version 2
		* as published by the Free Software Foundation.
		*
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/blkdev.h>
		#include <linux/gfp.h>
		#include <scsi/scsi_host.h>
		#include <linux/ata.h>
		#include <linux/clk.h>
		#include <linux/libata.h>
		#include <linux/mfd/syscon.h>
		#include <linux/mfd/syscon/atmel-smc.h>
		#include <linux/platform_device.h>
		#include <linux/ata_platform.h>
		#include <linux/platform_data/atmel.h>
		#include <linux/regmap.h>
		#include <linux/gpio.h>

		#define DRV_NAME "pata_at91"
		#define DRV_VERSION "0.3"

		#define CF_IDE_OFFSET 0x00c00000
		#define CF_ALT_IDE_OFFSET 0x00e00000
		#define CF_IDE_RES_SIZE 0x08
		#define CS_PULSE_MAXIMUM 319
		#define ER_SMC_CALC 1
		#define ER_SMC_RECALC 2

		struct at91_ide_info {
		unsigned long mode;
		unsigned int cs;
		struct clk *mck;
		void __iomem *ide_addr;
		void __iomem *alt_addr;
		};

		/**
		* struct smc_range - range of valid values for SMC register.
		*/
		struct smc_range {
		int min;
		int max;
		};

		struct regmap *smc;

		struct at91sam9_smc_generic_fields {
		struct regmap_field *setup;
		struct regmap_field *pulse;
		struct regmap_field *cycle;
		struct regmap_field *mode;
		} fields;

		/**
		* adjust_smc_value - adjust value for one of SMC registers.
		* @value: adjusted value
		* @range: array of SMC ranges with valid values
		* @size: SMC ranges array size
		*
		* This returns the difference between input and output value or negative
		* in case of invalid input value.
		* If negative returned, then output value = maximal possible from ranges.
		*/
		static int adjust_smc_value(int value, struct smc_range range, int size)
		{
		int maximum = (range + size - 1)->max;
		int remainder;

		do {
		if (*value < range->min) {
		remainder = range->min - *value;
		value = range->min; / nearest valid value */
		return remainder;
		} else if ((range->min <= value) && (value <= range->max))
		return 0;

		range++;
		} while (--size);
		*value = maximum;

		return -1; /* invalid value */
		}

		/**
		* calc_smc_vals - calculate SMC register values
		* @dev: ATA device
		* @setup: SMC_SETUP register value
		* @pulse: SMC_PULSE register value
		* @cycle: SMC_CYCLE register value
		*
		* This returns negative in case of invalid values for SMC registers:
		* -ER_SMC_RECALC - recalculation required for SMC values,
		* -ER_SMC_CALC - calculation failed (invalid input values).
		*
		* SMC use special coding scheme, see "Coding and Range of Timing
		* Parameters" table from AT91SAM9 datasheets.
		*
		* SMC_SETUP = 128*setup[5] + setup[4:0]
		* SMC_PULSE = 256*pulse[6] + pulse[5:0]
		* SMC_CYCLE = 256*cycle[8:7] + cycle[6:0]
		*/
		static int calc_smc_vals(struct device *dev,
		int setup, int pulse, int cycle, int cs_pulse)
		{
		int ret_val;
		int err = 0;
		struct smc_range range_setup[] = { /* SMC_SETUP valid values */
		{.min = 0, .max = 31}, /* first range */
		{.min = 128, .max = 159} /* second range */
		};
		struct smc_range range_pulse[] = { /* SMC_PULSE valid values */
		{.min = 0, .max = 63}, /* first range */
		{.min = 256, .max = 319} /* second range */
		};
		struct smc_range range_cycle[] = { /* SMC_CYCLE valid values */
		{.min = 0, .max = 127}, /* first range */
		{.min = 256, .max = 383}, /* second range */
		{.min = 512, .max = 639}, /* third range */
		{.min = 768, .max = 895} /* fourth range */
		};

		ret_val = adjust_smc_value(setup, range_setup, ARRAY_SIZE(range_setup));
		if (ret_val < 0)
		dev_warn(dev, "maximal SMC Setup value\n");
		else
		*cycle += ret_val;

		ret_val = adjust_smc_value(pulse, range_pulse, ARRAY_SIZE(range_pulse));
		if (ret_val < 0)
		dev_warn(dev, "maximal SMC Pulse value\n");
		else
		*cycle += ret_val;

		ret_val = adjust_smc_value(cycle, range_cycle, ARRAY_SIZE(range_cycle));
		if (ret_val < 0)
		dev_warn(dev, "maximal SMC Cycle value\n");

		cs_pulse = cycle;
		if (*cs_pulse > CS_PULSE_MAXIMUM) {
		dev_err(dev, "unable to calculate valid SMC settings\n");
		return -ER_SMC_CALC;
		}

		ret_val = adjust_smc_value(cs_pulse, range_pulse,
		ARRAY_SIZE(range_pulse));
		if (ret_val < 0) {
		dev_warn(dev, "maximal SMC CS Pulse value\n");
		} else if (ret_val != 0) {
		cycle = cs_pulse;
		dev_warn(dev, "SMC Cycle extended\n");
		err = -ER_SMC_RECALC;
		}

		return err;
		}

		/**
		* to_smc_format - convert values into SMC format
		* @setup: SETUP value of SMC Setup Register
		* @pulse: PULSE value of SMC Pulse Register
		* @cycle: CYCLE value of SMC Cycle Register
		* @cs_pulse: NCS_PULSE value of SMC Pulse Register
		*/
		static void to_smc_format(int setup, int pulse, int cycle, int cs_pulse)
		{
		setup = (setup & 0x1f) \| ((*setup & 0x80) >> 2);
		pulse = (pulse & 0x3f) \| ((*pulse & 0x100) >> 2);
		cycle = (cycle & 0x7f) \| ((*cycle & 0x300) >> 1);
		cs_pulse = (cs_pulse & 0x3f) \| ((*cs_pulse & 0x100) >> 2);
		}

		static unsigned long calc_mck_cycles(unsigned long ns, unsigned long mck_hz)
		{
		unsigned long mul;

		/*
		* cycles = x [nsec] * f [Hz] / 10^9 [ns in sec] =
		* x * (f / 1_000_000_000) =
		* x * ((f * 65536) / 1_000_000_000) / 65536 =
		* x * (((f / 10_000) * 65536) / 100_000) / 65536 =
		*/

		mul = (mck_hz / 10000) << 16;
		mul /= 100000;

		return (ns * mul + 65536) >> 16; /* rounding */
		}

		/**
		* set_smc_timing - SMC timings setup.
		* @dev: device
		* @info: AT91 IDE info
		* @ata: ATA timings
		*
		* Its assumed that write timings are same as read timings,
		* cs_setup = 0 and cs_pulse = cycle.
		*/
		static void set_smc_timing(struct device dev, struct ata_device adev,
		struct at91_ide_info info, const struct ata_timing ata)
		{
		int ret = 0;
		int use_iordy;
		unsigned int t6z; /* data tristate time in ns */
		unsigned int cycle; /* SMC Cycle width in MCK ticks */
		unsigned int setup; /* SMC Setup width in MCK ticks */
		unsigned int pulse; /* CFIOR and CFIOW pulse width in MCK ticks */
		unsigned int cs_pulse; /* CS4 or CS5 pulse width in MCK ticks*/
		unsigned int tdf_cycles; /* SMC TDF MCK ticks */
		unsigned long mck_hz; /* MCK frequency in Hz */

		t6z = (ata->mode < XFER_PIO_5) ? 30 : 20;
		mck_hz = clk_get_rate(info->mck);
		cycle = calc_mck_cycles(ata->cyc8b, mck_hz);
		setup = calc_mck_cycles(ata->setup, mck_hz);
		pulse = calc_mck_cycles(ata->act8b, mck_hz);
		tdf_cycles = calc_mck_cycles(t6z, mck_hz);

		do {
		ret = calc_smc_vals(dev, &setup, &pulse, &cycle, &cs_pulse);
		} while (ret == -ER_SMC_RECALC);

		if (ret == -ER_SMC_CALC)
		dev_err(dev, "Interface may not operate correctly\n");

		dev_dbg(dev, "SMC Setup=%u, Pulse=%u, Cycle=%u, CS Pulse=%u\n",
		setup, pulse, cycle, cs_pulse);
		to_smc_format(&setup, &pulse, &cycle, &cs_pulse);
		/* disable or enable waiting for IORDY signal */
		use_iordy = ata_pio_need_iordy(adev);
		if (use_iordy)
		info->mode \|= AT91_SMC_EXNWMODE_READY;

		if (tdf_cycles > 15) {
		tdf_cycles = 15;
		dev_warn(dev, "maximal SMC TDF Cycles value\n");
		}

		dev_dbg(dev, "Use IORDY=%u, TDF Cycles=%u\n", use_iordy, tdf_cycles);

		regmap_fields_write(fields.setup, info->cs,
		AT91SAM9_SMC_NRDSETUP(setup) \|
		AT91SAM9_SMC_NWESETUP(setup) \|
		AT91SAM9_SMC_NCS_NRDSETUP(0) \|
		AT91SAM9_SMC_NCS_WRSETUP(0));
		regmap_fields_write(fields.pulse, info->cs,
		AT91SAM9_SMC_NRDPULSE(pulse) \|
		AT91SAM9_SMC_NWEPULSE(pulse) \|
		AT91SAM9_SMC_NCS_NRDPULSE(cs_pulse) \|
		AT91SAM9_SMC_NCS_WRPULSE(cs_pulse));
		regmap_fields_write(fields.cycle, info->cs,
		AT91SAM9_SMC_NRDCYCLE(cycle) \|
		AT91SAM9_SMC_NWECYCLE(cycle));
		regmap_fields_write(fields.mode, info->cs, info->mode \|
		AT91_SMC_TDF_(tdf_cycles));
		}

		static void pata_at91_set_piomode(struct ata_port ap, struct ata_device adev)
		{
		struct at91_ide_info *info = ap->host->private_data;
		struct ata_timing timing;
		int ret;

		/* Compute ATA timing and set it to SMC */
		ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0);
		if (ret) {
		dev_warn(ap->dev, "Failed to compute ATA timing %d, "
		"set PIO_0 timing\n", ret);
		timing = *ata_timing_find_mode(XFER_PIO_0);
		}
		set_smc_timing(ap->dev, adev, info, &timing);
		}

		static unsigned int pata_at91_data_xfer_noirq(struct ata_queued_cmd *qc,
		unsigned char *buf, unsigned int buflen, int rw)
		{
		struct at91_ide_info *info = qc->dev->link->ap->host->private_data;
		unsigned int consumed;
		unsigned int mode;
		unsigned long flags;

		local_irq_save(flags);
		regmap_fields_read(fields.mode, info->cs, &mode);

		/* set 16bit mode before writing data */
		regmap_fields_write(fields.mode, info->cs, (mode & ~AT91_SMC_DBW) \|
		AT91_SMC_DBW_16);

		consumed = ata_sff_data_xfer(qc, buf, buflen, rw);

		/* restore 8bit mode after data is written */
		regmap_fields_write(fields.mode, info->cs, (mode & ~AT91_SMC_DBW) \|
		AT91_SMC_DBW_8);

		local_irq_restore(flags);
		return consumed;
		}

		static struct scsi_host_template pata_at91_sht = {
		ATA_PIO_SHT(DRV_NAME),
		};

		static struct ata_port_operations pata_at91_port_ops = {
		.inherits = &ata_sff_port_ops,

		.sff_data_xfer = pata_at91_data_xfer_noirq,
		.set_piomode = pata_at91_set_piomode,
		.cable_detect = ata_cable_40wire,
		};

		static int at91sam9_smc_fields_init(struct device *dev)
		{
		struct reg_field field = REG_FIELD(0, 0, 31);

		field.id_size = 8;
		field.id_offset = AT91SAM9_SMC_GENERIC_BLK_SZ;

		field.reg = AT91SAM9_SMC_SETUP(AT91SAM9_SMC_GENERIC);
		fields.setup = devm_regmap_field_alloc(dev, smc, field);
		if (IS_ERR(fields.setup))
		return PTR_ERR(fields.setup);

		field.reg = AT91SAM9_SMC_PULSE(AT91SAM9_SMC_GENERIC);
		fields.pulse = devm_regmap_field_alloc(dev, smc, field);
		if (IS_ERR(fields.pulse))
		return PTR_ERR(fields.pulse);

		field.reg = AT91SAM9_SMC_CYCLE(AT91SAM9_SMC_GENERIC);
		fields.cycle = devm_regmap_field_alloc(dev, smc, field);
		if (IS_ERR(fields.cycle))
		return PTR_ERR(fields.cycle);

		field.reg = AT91SAM9_SMC_MODE(AT91SAM9_SMC_GENERIC);
		fields.mode = devm_regmap_field_alloc(dev, smc, field);

		return PTR_ERR_OR_ZERO(fields.mode);
		}

		static int pata_at91_probe(struct platform_device *pdev)
		{
		struct at91_cf_data *board = dev_get_platdata(&pdev->dev);
		struct device *dev = &pdev->dev;
		struct at91_ide_info *info;
		struct resource *mem_res;
		struct ata_host *host;
		struct ata_port *ap;

		int irq_flags = 0;
		int irq = 0;
		int ret;

		/* get platform resources: IO/CTL memories and irq/rst pins */

		if (pdev->num_resources != 1) {
		dev_err(&pdev->dev, "invalid number of resources\n");
		return -EINVAL;
		}

		mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

		if (!mem_res) {
		dev_err(dev, "failed to get mem resource\n");
		return -EINVAL;
		}

		irq = board->irq_pin;

		smc = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "atmel,smc");
		if (IS_ERR(smc))
		return PTR_ERR(smc);

		ret = at91sam9_smc_fields_init(dev);
		if (ret < 0)
		return ret;

		/* init ata host */

		host = ata_host_alloc(dev, 1);

		if (!host)
		return -ENOMEM;

		ap = host->ports[0];
		ap->ops = &pata_at91_port_ops;
		ap->flags \|= ATA_FLAG_SLAVE_POSS;
		ap->pio_mask = ATA_PIO4;

		if (!gpio_is_valid(irq)) {
		ap->flags \|= ATA_FLAG_PIO_POLLING;
		ata_port_desc(ap, "no IRQ, using PIO polling");
		}

		info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);

		if (!info) {
		dev_err(dev, "failed to allocate memory for private data\n");
		return -ENOMEM;
		}

		info->mck = clk_get(NULL, "mck");

		if (IS_ERR(info->mck)) {
		dev_err(dev, "failed to get access to mck clock\n");
		return -ENODEV;
		}

		info->cs = board->chipselect;
		info->mode = AT91_SMC_READMODE \| AT91_SMC_WRITEMODE \|
		AT91_SMC_EXNWMODE_READY \| AT91_SMC_BAT_SELECT \|
		AT91_SMC_DBW_8 \| AT91_SMC_TDF_(0);

		info->ide_addr = devm_ioremap(dev,
		mem_res->start + CF_IDE_OFFSET, CF_IDE_RES_SIZE);

		if (!info->ide_addr) {
		dev_err(dev, "failed to map IO base\n");
		ret = -ENOMEM;
		goto err_put;
		}

		info->alt_addr = devm_ioremap(dev,
		mem_res->start + CF_ALT_IDE_OFFSET, CF_IDE_RES_SIZE);

		if (!info->alt_addr) {
		dev_err(dev, "failed to map CTL base\n");
		ret = -ENOMEM;
		goto err_put;
		}

		ap->ioaddr.cmd_addr = info->ide_addr;
		ap->ioaddr.ctl_addr = info->alt_addr + 0x06;
		ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;

		ata_sff_std_ports(&ap->ioaddr);

		ata_port_desc(ap, "mmio cmd 0x%llx ctl 0x%llx",
		(unsigned long long)mem_res->start + CF_IDE_OFFSET,
		(unsigned long long)mem_res->start + CF_ALT_IDE_OFFSET);

		host->private_data = info;

		ret = ata_host_activate(host, gpio_is_valid(irq) ? gpio_to_irq(irq) : 0,
		gpio_is_valid(irq) ? ata_sff_interrupt : NULL,
		irq_flags, &pata_at91_sht);
		if (ret)
		goto err_put;

		return 0;

		err_put:
		clk_put(info->mck);
		return ret;
		}

		static int pata_at91_remove(struct platform_device *pdev)
		{
		struct ata_host *host = platform_get_drvdata(pdev);
		struct at91_ide_info *info;

		if (!host)
		return 0;
		info = host->private_data;

		ata_host_detach(host);

		if (!info)
		return 0;

		clk_put(info->mck);

		return 0;
		}

		static struct platform_driver pata_at91_driver = {
		.probe = pata_at91_probe,
		.remove = pata_at91_remove,
		.driver = {
		.name = DRV_NAME,
		},
		};

		module_platform_driver(pata_at91_driver);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("Driver for CF in True IDE mode on AT91SAM9260 SoC");
		MODULE_AUTHOR("Matyukevich Sergey");
		MODULE_VERSION(DRV_VERSION);

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